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Most recent posts by "Greg Funk"

Is that a Mandrel on my Back, or Do I have a Case of Encircled Flux?
Blog Category: Data Centers

Posted by: on July 16, 2013

I am always surprised to find out how many field technicians have never heard of mandrels for multimode fiber testing, much less the latest encircled flux method.

No, a mandrel is not a type of monkey—that’s a mandrill, a primate from Africa that’s closely related to the baboon. And encircled flux is not something that will put you in the hospital—that’s inflammatory flux, a nasty disease of the intestines.

However, with the lack of knowledge, some technicians working in the data center space might feel like they do in fact have a monkey on their back or a bad case of intestinal flu when confronted with these two fiber testing methods.

Not to worry… you just need to know the basics.

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Tags: Data Center, Fiber Testing, Mandrel, Encirlced Flux, TIA, Standards


The Mystical Art of MPO Testing
Blog Category: Data Centers

Posted by: on August 21, 2013

ANSI/TIA 568-C standards require Method B (also known as 1 Jumper) for fiber testing, which uses a single jumper for setting a reference.

But when it comes to testing 12-fiber multifiber push-on (MPO) trunk cables commonly used for 10 and 40 gigabit permanent links in today’s data center, testing can become rather bewildering--especially with legacy testing equipment that does not have an MPO interface. Enter the 3 Jumper method.

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Don't Paint Yourself Into A Corner
Blog Category: Data Centers

Posted by: on August 28, 2014

While it might be tempting to paint unshielded twisted-pair (UTP) cables or patch cords to match wall color or other surrounding environments, you could be painting yourself into a corner.

UTP cables are NOT designed to withstand exposure to the chemical compounds found in common paint products. In fact, Belden's longstanding policy is that cables should not come in contact with any type of paint contamination, regardless of application.

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Don't Get In Deep Water
Blog Category: Data Centers

Posted by: on September 25, 2014

As a follow-up to the blog on the reasons why UTP cables should not be painted, let's talk about cables that have been exposed to water or other liquids.

While the jacketing on indoor riser- and plenum-rated UTP cables may seem impervious to liquids, let me remind you again that it is actually porous. In fact, any cable rated for indoor use only, whether copper or fiber, should not be exposed to liquids for any length of time.

Let’s take a look at why.

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